±1°C Accurate, 13-Bit,

Digital Temperature Sensor

ADT7301

Rev. B

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FEATURES

13-bit temperature-to-digital converter

−40°C to +150°C operating temperature range

±0.5°C typical accuracy

0.03125°C temperature resolution

Shutdown current of 1 μA

SPI- and DSP-compatible serial interface

Shutdown mode

Space-saving SOT-23 and MSOP packages

Compatible with AD7814

APPLICATIONS

Medical equipment

Automotive

Environmental controls

Oil temperature

Hydraulic systems

Cellular phones

Hard disk drives

Personal computers

Electronic test equipment

Office equipment

Domestic appliances

Process control

FUNCTIONAL BLOCK DIAGRAM

SERIAL

BUS

INTERFACE

ADT7301

SCLK

DIN

DOUT

GND

13-BIT

ANALOG/DIGITAL

CONVERTER

TEMPERATURE

VALUE

REGISTER

BAND GAP

TEMPERATURE

SENSOR

CS

Figure 1.

GENERAL DESCRIPTION

The ADT7301 is a complete temperature monitoring system

available in SOT-23 and MSOP packages. It contains a band gap

temperature sensor and a 13-bit ADC to monitor and digitize

the temperature reading to a resolution of 0.03125°C.

The ADT7301 has a flexible serial interface that allows easy

interfacing to most microcontrollers. The interface is compati-

ble with SPI

DSPs. The part features a standby mode that is controlled via

the serial interface. The ADT7301’s wide supply voltage range,

low supply current, and SPI-compatible interface make it ideal

for a variety of applications including personal computers,

office equipment, automotive, and domestic appliances. The

ADT7301 is rated for operation over the −40°C to +150°C

temperature range. It is not recommended to operate the device

at temperatures above +125°C for greater than a total of 5%

(5,000 hours) of the lifetime of the device. Exposure beyond this

limit affects device reliability.

PRODUCT HIGHLIGHTS

1.

On-chip temperature sensor that allows an accurate

measurement of the ambient temperature. The measurable

temperature range is −40°C to +150°C.

2.

Supply voltage of 2.7 V to 5.25 V.

3.

Space-saving 6-lead SOT-23 and 8-lead MSOP packages.

4.

Typical temperature accuracy of ±0.5°C.

5.

13-bit temperature reading to 0.03125°C resolution.

6.

Shutdown mode that reduces the power consumption to

7.

Compatible with AD7814.